Regulator for dynamo-electric machines



(No Model.) 2 sheets- Sheet I.

W. K. FREEMAN. REGULATOR FOR DYNAMO ELEGTRIG MAGHINES.

WITNESSES; N I IISIJEFITDW Walfw W. K. FREEMAN. I REGULATOR FOR DYNAMO ELECTRIC MACHINES. No. 441,794. Patented Dec. 2, 1890.

(No Model.) 2 SheetsSheet 2.

UNITED STATES PATENT OFFICE.

WALTER K. FREEMAN, OF BROOKLYN, NE\/V YORK, ASSIGNOR TO \VILLIAM S. HADAIVAY, JR, TRUSTEE, OF BOSTON, MASSACHUSETTS.

REGULATOR FOR DYNAMO-ELEGT RIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 441,79 4, dated December 2, 1890.

Application filed September 20, 1890. Serial No. 365,677. (No model.)

To all whom it may concern: exciter; E, the cores thereof; F F, the core- Be it known that I, WALTER K. FREEMAN, extensions,and G the armature, whose shaft a citizen of the United States, and a resident is connected to and driven by the shaft of the of Brooklyn, in the county of Kings and State main machine. 5

5 of New York, have invented certain new and The cores E E are rigidly secured to the useful Improvements in Regulators for Dyframe-work B of the main machine by bolts namo-Electric Machines; and I do hereby dc or otherwise, and upon their reduced outer clare the following to be a full and an exact ends are 'rnountedthe arms or core-extensions description of theinvention,which will enable F F. These extensions are applied so as to 60 others skilled in the art to which it apper- .be capable of being turned or rotated upon tains to make and use the same. the cores E E, and are made tapering and My invention relates particularly to that curved, so as to conform generally to the conclass of dynamo-electric machines in which tour of the armature G, inclosed or partially an auxiliary dynamo or exciter is employed inclosed by them.

to charge the field-magnets of the main ma- To the extremities of the poles E E issechine. In some of its features it is applicable cured by suitable bolts H H a bracket I or to dynamos of various forms. support, having an upwardly-extending arm My invention consists in the novel con- 1', which serves to support the outer bearings struction of the field-magnets of a dynamo J of the armature-shaft, and having also a 70 and in the means for adjusting the samereladownwardly-extending arm orlngI as shown t'ively to the armature, whereby the current in Figs. 2 and developed is enabled to be regulated and con- Lugs F F- are formed upon the lower portrolled by mechanical means. tions of the pole-extensions F F,-as shown in My invention further consists in certain im- Fig. 3. These lugs F F have secured to them 7 5 proved details of construction, relating pareyebolts K K, whose eyes are provided, re-

I ticularly to the mannerof connecting the fieldspectively, with right and left hand internal magnets of the exciter with the frame of the screw-threads, with which co-operate right main machine, all as will be fully described and left screw-threads L L on an adj ustinghereinafter. shaft L,as shown. Said adjusting-shaftpasses 8o 0 In the accompanying drawings, Figure 1 through an opening in the downwardly-prorepresents a perspective view of the auxiliary ject-ing lug 1 Figs. 2 and 3, and is provided dynamo or exciter of a dynamo-electric ma,- with nuts or collars M M on opposite sides of chine, showing a portion of the main frame said lug, whereby it is enabled to be freely of the latter, its main shaft, upon which the rotated and yet have no longitudinal move- 85 3 5 armature of the eXciter is mounted, and the meut. Al1and-wheel N, applied to the end of bearings for said shaft. Fig. :2 is an end elethe shaft enables it to be turned with ease in vation of the eXciter, showing particularly the either direction. form and construction of the pole-extensions From the described construction it is apof the field-magnets and the devices for eifectparent that by manipulating the hand-wheel o 0 ing the adjustment thereof. Fig. 3 is a bot- N the shaftL can be rotated and the pole-extom plan view of the same. Fig. 4 is a pertensionsFcaused to simultaneously approach spective view of a dynamo to which my reguor recede from the armature G, and thus by lating devices are. applied. varying the magnetic field of force cause a Similar letters of reference in the several current of greater or less strength to be de- 5 figures indicate the same parts. veloped. In the adj u-stment of these pole-ex- Referring particularly to Fig. 1, A repretensions it will be noted that it is principally sents the shaft of the main dynamo; B, a porthe outer and narrower portions of them that tion of the frame of said machine, and 0 one are caused to approach or recede from the of the bearings on said frame in which the armature, the greater body of metal near the I00 main shaft is journaled. bases or pivotal points remaining at all times D D are the coils of the'field-magnet of the in such effective proximity to the armature as to prevent destructive sparking and other inj urious effects.

WVith pole-extensions constructed and adjusted in accordance with my invention the strength of current developed by the exciter, and consequently the current of the main machine, is enabled to be regulated and controlled promptly and to the greatest nicety.

The connection of the exciter to the main dynamo in the manner described renders the machine as a whole simple, strong,'compact, and efficient.

In Fig. 4; a dynamo is shown to which my regulating devices are applied, the current generatedbeing regulated to a fractional part of a unit without changing the speed of the armature or introducing any resistance in the field or shunt circuit.

Having thus described my invention, what I claim as new is- 1. In a dynamo-electric machine, the combiuation, with the armature and field-mag nets, of the pole-pieces pivotally mounted on the ends of said magnets and having thelugs or projections F F, the eyebolts journaled in said lugs, and the right-and-left-hand screw-shaft co-operatin g with said eyebolts to vary the position of the pole-pieces simultaneously with relation to the armature, substant-ially as described.

2. In a dynamo-electric machine, the combination, with the field-magnets and the polepieces surrounding and movably mounted on the ends thereof, of the bracket secured on the ends of the magnets to retain the polepieces in position, and means, substantially as described, for adjusting said pole-pieces with relation to the armature, as described.

3, In a dynamo-machine, the combination of the cores of the field-magnets, the bracket substantially screwed to the end of said cores, having the downwardly-extending lug for receiving the screw-shaft, the pivoted pole extensions, and the screw-shaft and its hand-wheel, substantially as described.

4. In a dynamo-machine, the combination of the armature, the field-magnets having thepivoted pole-extensions, the bracket on the ends of the cores, having the upwardly-extending supporting-arm and the downwardlyextending lug, and the adjustable screwshaft and its handovheel, substantially as described.

5. The combination, with the frame of the main dynamo-machine and the shaft of said main machine, of the field-magnets, the auxiliary dynamo or exciter connected to and supported by said main frame, the adjustable pole-extensions of said exciter, and the armature thereof, connected to the shaft of the main machine, substantially as described.

6. The combination, with the frame of the main machine and the shaft of said machine, of the field-magnets of said machine, the field-magnets, the exciter connected to and supported bysaid main frame, the adjustable pole-extensions of said exciter, the bracket on the end of the core of the field-magnets, the armature, and the adjustable right-andleft screw-shaft, substantially as described.

7. In the herein described dynamo, the bracket I, adapted to be secured to the ends of the cores of the'field-magnets, and having the upper arm lforsupportingthe armatureshaft, and the lower arm or lug I for receiving the adjustable right-and'left screw-shaft, substantially as described.

XVALTER K. FREEMAN.

Witnesses:

WILLIAM S. I-Innmvav, Jr., MELVILLE GnURcn. 

